Wire-tensioning device.



W. G. LIEBIG.

WIRE TENSIONING DEVICE.

APPLlcATloN FILED MAR.15. 1915.

lj, Patented Jan. 11, 1.916.'

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" waaraan armere, or nnrnorn- Mrcrrrean.

atenten declare the following to he z nlull, clear, and

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f view, partly. in

exact descption' ofthe same, such as will enable others skilled in the art to which it pertains tof-make. and use the-same, referencebeing had to the accompanying drawings, which form a part or this'specication.

'lhis invention relates to wire-tensioning devices for staple-forming machines, and has for its object the provision ot a constant spring tension on the wire and on the milled, wheel, by which its travel is-ed'ected, whereby uniformity inthe length otthe staples which are made is secured.

ln the drawings :f-Fig'ure l shows the im'- pr'oved device lin front elevation, together with so much of the adjacent actuating parts which l employ therewith as is necessary to an understanding of the operation Vothe device. Fig. 2 is a sectional elevation along the line 2&2 of Fig. l. Fig. 3 is a plan section, along the line 3.- l

of Figi,

Although my improvements are obviously adapted to variousv types of staple formingi machines, l have in Fig. l shown a fragmentary elevational viewy of vone heretofore patented by me, and to whicfhlmy improvements herein described are applied in which v l2 represents a power shaft and i3 a track cam member ykeyed to rotate therewith, to

' cause the vertical reciprocatory movement of the slidell' and other similar slides not 'all here necessary tobe shown. @n the slide le l is pivotally mounted a'bracket l5, whose adjustable pawl finger 16 is yieldingly held in` position by the spring 17. 'lhe lower point of the pawl engages a pivoted ratchet-.wheel 18, which is rotatably mounted between the forked ends of the pivoted angular arm 1.9; and this ratchet wheel is yieldingly held against the wire 23 by means of the spring '20 pressing against the adjustable screw stop 21, over which the' yoked'end of the lever arm 22 engages.

A t each rotation .of the ratchet i8, dueto the vertical reciprocation of the slide le and its supported parts, the milled periphery or the wheel 2d, which is preferably integral with the ratchet wheel 18, cooperates with the idler roller 25 in advancing the wire 23,

Specication of Letters latent.

Application filed Iliarch 15,

Patented dano ill, i216. 1915.v serial nu. 14,567.'

vwhich passes between them, from right to left, as shown in Fig. l, so as to project the wire toward the guide block 26 and over the anvil 27, where it is sheared o by the staple-forming die 28, which is vertically reciprocated in timed relation to the movement of the wire by another slide, similar to the member lll, which it is notnccessary here to show, and thence driven downwardly toward the guide 29, which immediately overhangs the holes in the brush blank or other articles to be stapled.

ln order to insure uniformity in the length of the wire projected at each stroke of the pawl linger 16, it is necessary not only to keep the. wire, as fed from the supply spool, taut, but to provide also against even comparatively slight slippage of the milled wheel 24C. rEhis should moreover be adjustable'wth respect to the frontend-back locatiorl of the wire and the other parts, particu-- larly the anvil, and also with respect to the thickness of 4the wire used under various conditions. To care for the former, l provide a threaded centrally bored tension block 31, which is screwed into the frame of the machine, and within which is located the removable headed piece 32 anda slidable piston piece 33, which is yieldingly projected theretoward by the spring 34:, whose tensiony is regula-ted ,by the lscrew 35 and locking washer 36. By this means a consta-'ntthough yielding pressure is kept on the wire 23, so that in the intervals between for ward projections it does not wholly or par tially fall back from its position between the rollers 24C and 25. This holding ot the wire, however, would not,vin all, cases at least, be suliicient without provision for yieldingly holding the milled wheel 2e,

against loosely rocking on its pivot pin between downward strokes of the pawl linger 16. To provide thereagainst, l employ a. tension block 37,- sirnilar to the screw 3l already described, which is mounted in the yoked lever 19, and through whose central bore a screw 38 engages against the stem 39 of the piston piece 40. Between the forward, end of this screw"38 and the piston. 4&6 en 1 gages the sprin 4l, by which the piston head 40 is yieldmgly held against the side face of the milled wheel2d, not suliiciently strongly to interfere with its rotation when actuated by the movement of the pawl hn@ ger 16, but yet suilicien'tly strongly to hold' the former in the position inwhich the cessan tion ofthe wheels rotation, under the influence of the pawl finger 16, leaves it.

lVhat I claim is l. In combination with a pair of feed rollers, means for yieldingly forcing one of said rollers into peripheral engagement with the other, means for periodically rotating one of 'said rollers through a predetermined peripheral distance, and means for yieldingly engaging said rotated roller and a length of wire interposed between its peri- 'phery and that of the other roller to hold them against slippage between successive operations, substantially as described.

2. In combination with a supporting frame, a bracket pivotally supported thereon, a pair of pivoted rollers, one of which is mounted upon said frame and the other of which is mounted in said bracket, spring means for projecting said last-named roller toward a position of peripheral engagement i with the first-named roller, means for periodically rotating said last-named roller, thereby projecting to a predetermined degree a wire 'interposed between the rollers, and means for frictionally holding said rotated roller and the wire against slippage between successive cycles of operation.

3. In combination with a projecting roller and an idler roller between which a wire is adapted to pass, means for periodically actuating the projecting roller to frictionally advance the wire a predetermined distance, and a pair of adjustably resilient members adapted to engage the projecting roller andthe wire to prevent slippage thereof between successive cycles of operation.

4. In combination with a pivoted arm, resilient' means for normally holding one end thereof in depressed position, a projecting roller rotatably supported in the depressed end of said pivoted arm, with its periphery in frictional engagement with a wire whose periodical advancement is desired,

means for rotatively actuating said roller at desired intervals to cause the travel of the wire accordingly, and resilient means engaging the projecting roller and the wire, whereby the same are held against slippage between successive movements thereof, substantially as described.

5. In combination with a pivoted arm, a wire-advancing roller rotatably supported in one end thereof, a spring engaging said arm whereby said roller is yieldingly held in frictional engagement with a wire leading troma source of supply, -a pair of ad- Y justable spring stops engaging sai., roller and the wire whereby the same are held against undesired movement, and means 'for intermittently rotating said roller to advance the wire a predetermined length, substantially as described.

6. 4In combination with a reciprocating actuating pawl, a ratchet member provided with a milled peripheral portion, a p ivoted arm member in which said ratchet member is rotatably mounted, an idler roller between which and the periphery ofthe ratchet-member a length of wire is adapted to pass, and adjustable spring stops whereby the wire and the ratchet member are held against undesired movement between successive actuations due to the movement of said reciprocating pawl. j

7. In combination with a supporting -bracket, a roller member rotatably supported thereby in yposition to frictionally engagea length of wire whose periodical projection 1s desired, intermittent actuating lmeans therefor, and an adjustable springprojected stop adapted to prevent undesired movement of the roller member and ofthe -wire between successive actuations.

8. .In combination ,with a supporting member, a pivoted bracket member, a spring engaging said bracket member to yieldingly project one end thereof against an external object, and means for varying the tension of said spring, substantially as described.

9. fire-tensioning means, comprising a pair of rotatable wheels between whose adjacent peripheral portions a wire is adapted to pass, means for intermittently rotating one of said wheels through a predetermined periplie al distance, and adjustably resilient means or frictionally engaging the wire and the rotated Wheel whereby undesired movement thereof between successive operations is prevented.

l0. The combination of a rotatable wheel adapted to frictionally engage a length of wire with its roughened peripheral portion, means for intermittently rotating said wheel through an arc of predetermined size thereby advancing the wire accordingly, and an adjustable spring stop adapted to frictionally engage said wheel to prevent undesired rotative movement thereofo In testimony whereof, I sign this specification in the presence of two witnesses.

WILLIAM G. LIEBIG. l/Vitnesses: i

JEFFERSON C. THURBER, MARION F. KIEFER. 

